I entered a blog, and when I hit submit I got this message:
Data submitted to this page is invalid.
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It took me a few attempts, but I figured out that there is a limit on how long a title can be. But the message isn't very clear. I would suggest (if you are open to suggestions), either putting in a message that details more clearly that the title limit has been exceeded, or (if possible), limit the number of character one can enter in the title text box.
I entered my blog and changed the Entry Time to the date of the trip (rather than right now). I hit publish, but when I viewed the blog, it showed the current date and time, not the time I entered.
I went in and changed the date and time a second time, and this time it did use the date entered. I was able to reproduce this problem on all three of the blogs I entered tonight.